Automatic fire-alarm.



P. 130mm.

AUTOMATIC FIRE ALARM.

APPLICATION FILED AUG. 13, 1908.

931,377 Patented Aug. 17, 1909.

3 H 00 n to z NE-Mme FBOJZJ/Zdi WW rarnn r PIETRO BONINI, OF NEW YORK,N. Y.

' AUTOMATIC FIRE-ALARM.

Specification of Letters Patent.

Patented Aug. 17, 1809.

Application filed hugust 13, 1908. Serial No. 448,413.

that t *pe desi ned particularly for use in Es i connection with firealarms or like electric signals, and theinvention has for its object animproved thermostat which embodies a peculiap arrangement of parts,whereby it is rendered-susceptible of convenient and ac curateadjustment, so as to regulate the degree or" temperature at which thecircuit will be closed, the device being also arranged to indicate thetemperature for which the ther-. mostat is set.

lVith these and other objects in View that will more fully appear as thedescription proceeds, the invention consists of, certain constructions,arrangements and combinations of the parts that 1 shall hereinafterfully describe and then point out the novel features thereof in theappended claims.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawings, in which:

Figure 1 is a perspective view of a thermostat constructed in accordancewith my invention and Fig. 2 iso front elevation- I thereof.

Corresponding and like parts are referred to in the followingdescript'on and indicated in all the views of the rawings by the samereference characters.

In carrying out myinvention, I provide a thermostatic device mounted ina housing 1 which may-be of any desired or approved construction, ordesigmexcept as hereinafter noted, and the interior of which ispreferably rendered accessible by means of a suitable hinged door 52.Two bars 3 are secured to the top of this housing and depend therefromin close proximity to two opposite sides of the housing, each of thesebars carryingat its upper end an insulated block 4. Electricallyconnected to the lowerends of the bars 3 is an inverted V-shapedthermostatic member 5 which is preferably formed of corrugated zinc-orother suitable metal and which is provided at its apex or middle pointwith a bearing 0 in which is loosely mounted a nut T. This nut isdesigned to work upon a lower threaded extremity of a verticallydisposed connecting rod which is pivotally secured at its upper end toone end of a horizontally disposed lever 9 and is arranged to operatethe same, said lever being fulcrumed at an intermediate point upon andinsulated from a supporting block 19 depending from the top of thehousing as shown. 11 designates a second thermostatic member which isalso constructed of corrugated metal and is flshaped in form,

and which is connected at its ends to the 0pposite blocks d with itsmiddle point in vertical alinement with and in slightly spaced relationto bearin (i of the other thermostatic member, said thermostatic member11 being formed near its middle with an insulated opening 12 extendingtherethrough to permit the connecting rod 8 to pass upwardly foroperative connection with the lever .9. Secured to the thermostaticmember 11, preferably near the middle point of the same, is a verticallydisposed connecting rod 13 which is designed to operate a second leverlet and for this purpose has its upper end pivotally secured to the sameat an intermediate point thereof, said lever beingtulcrumed at one endon and insulated from the supporting block and extending in the samedirection as the lever 9, although positioned somewhat below the same.The free extremity of the lever 9 is' preferably hooked as shown, and isdesigned to engage the corresponding end of the lever is in case of afire, and said extremities of the levers thus constitute'contact points15 which may be provided with platinum surfaces, if desired, in themanner common to the art.

In practice it will'be found necessary to regulate the normal spacebetween the contact points 15 to prevent sparks from jumping across thisgap when the thermostat is electrically connected with the fire alarmsystem, and as one means for accomplishing this I provide a bevel gearwheel 16 which is rigidly secured to the nut 7, preferably above thebearing (3 and which engages a relatively small bevel pinion 17 carriedon one end of a horizontally disposed shaft 18, the shaft beingjournaled at said end in the bearing (3 and extending outwardlytherefrom through an insulated opening in one side wall of the housingand terminating upon the exteriorof the same in a head. or

knob 19. With this construction it will be manifest that means areafiorded whereby the nut 7 may be conveniently adjusted upon theconnecting rod 8 in order to regulate the gap between the contactpoints, by the mere stat is designed to be positioned in thewall,

or floor, or ceiling of a building, preferably the latter, with theperforated wall 22 outermost so that the interior of the thermostat willbe in communication with the room. \Vhen placed in this position thethermostatic members 5 and 11 will expand equally under ordinarytemperatures,but when an abnormal temperature is suddenly developed inthe room, as in the case of fire, the heatwill first come in contactwith the thermostatic member 5, as the latter is positioned nearer theperforated wall 22, and such thermostatic member will thus expand underthe influence of the heat at a greater rate than the thermostatic member11, so as to rock the lever 9 a greater distance than the lever 14,thereby efi'ecting engagement of the contact points 15.

The thermostat is adapted to be connected up in an electricalarm'circuitthrough the instrumentality of two binding posts 23 and 24arranged at the opposite sides of the housing, the binding postdesignated 23 be? ing electrically connected by a wire 25 to theadjacent bar 3, while a wire 26 connects the other binding post 24 withthe upper thermostatic member 11. The current enters the thermostat byone of the binding posts, say the binding post 23 and passes through the.wire 25 and the corresponding bar 3 to the lower thermostatic member 5.From the latter the current. passes through the nut 7 and thence'alongthe connecting rod 8 to the-lever 9. \Vhen the contact points 15 i areengaged upona sudden change of temperature the current passes from thelever 9 to the lever 14 and from the latter to the upper thermostaticmember 11 through the medium of the connecting rod 13, the currentleaving the thermostat by way of the wire 26 and the bindin'g post 24cand continuing along the circuit to eflect the actintion ot'suitablealarm mechanism.

Having thus described the invention, what is claimed as new is: j

' '1-. -A',thermostat comprising thermostatic members constructed ofexpansible material mostatic members and the corresponding membersconstructed of expansible material and insulated from each other, leverscarrying, normally spaced contact points, and convnecting rods securedto the thermostatic members and pivoted to the respective levers, oneofthe connectingrods having a positive and adjustable connection with thecorresponding thermostatic member, as and for the purpose specified.

2. A thermostat comprising thermostatic and insulated from each other,levers carrying normally spaced contact points, connect 'ing rodssecured to the thermostatic members and the respective levers, and athreaded c onnection'between one of the connecting rods andthe-corresponding thermostatic member.

3.,A thermostat comprising thermostatic members constructed ofexpansible material and insulated from each other, levers carryingnormally spaced contact points, connecting rods secured to thethermostatic members and the respective levers, a positive andadjustable connection between one of the therconnecting rod, and meansforregulating said connection to eifect different adjustments of theparts.

4. A thermostat comprising thermostatic members constructed ofexpansible material and insulated from each other, levers carryingnormally'spaced contact points, a nut carried by one of the thermostaticmembers, and connecting rods secured to the respective levers and tothethermostatic members, one

of the connecting rods being adjustablyoengag'ed with the nut. V 5. Athermostat, comprising separate thermostatic members constructed ofexpansible material, and one of which is provided with a bearing, a nutloosely mounted in the hearing, levers carrying normally spaced contactpoints, and connecting rods secured to the respective 'levers andthermostatic members, and one of which has one end threaded andadjustably engaged by the nut, as and for the purpose specified. q '6. Athermostat, comprising a housing,

separate thermostatic members mounted in the housing and constructed ofexpansible material and one ofwhich is provided with a bearing, a nutloosely mounted in the bearing, carrying normally spaced contact points,connecting rods secured at one ,end to the levers and at their otherends to the respective thermostatic members, one of said connecting rodsbeing threaded and having an adjustable engagement with the nut, a gearwheel rigid with the nut, a shaft journaled at one end in the bearingand. extending outwardly therefrom through the housing, and a pinionprovided at said end of the shaft and meshing with the gear Wheel, asand for the purpose specified.

7. Athermostat comprising insulated ther- .130

, spective levers, oneof the connecting rods being threaded and engagedwith the nut, and

means for turning the nut.

8; A thermostat comprising insulated thermostatic members constructed ofexpansible material, and one ofwhich is provided with a nut, leverscarrying normally spaced contact points, connect1ng rods carrled by the1 thermostatic members and secured to the respective levers, one of theconnecting rods being threaded and. engaged with the nut, and gearingfor turning the nut.

-9..A thermostat comprising expansible thermostatic members, one ofwhich is provided with a nut, levers carrying normally spaced con(actpoints, connecting rods carried by the thermostatic members and securedto the respective levers, one of the connect-ing rods having a threadedengagement with the nut, and a rotatable shaft having a gearingconnection with the nut.

10. A thermostat comprising expansible thermostatic members, leverscarrying normally spaced contact points, connecting rods secured to thethermostatic members andto the respective levels, a positive andadjustable connection' between one of the thermostatic members and thecorresponding connecting rod, means for regulating said connection toeffect difierent adjustments of the parts, and indicating means actuatedby said regulating means.

.11. A thermostat comprising e rpansible thermostatic members, leverscarrying normally spaced contact points, connectingrods secured to thethermostatic members and the respective levers, a positive andadjustable connection between one of the thermostatic members and thecorresponding-connecting rod, a shaft for regulatm said adjustableconnectioma hand rigid-with the shaft, and a dial over which'the hand isadapted to be rotated by and upon the turning of the shaft. In testimonywhereof I afiixmy signature in presence of two witnesses.

PIETRO BONINI. [n s] Witnesses LoUIs M. PIGKER, SAMUEL H. Gonmxo.

